Updated: Jun 02, 2026
Location and Projects
Address
11 HARTFORD AVE, Old Lyme, CT, 06371
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William O'brien Plumber
William O'brien, 11 Hartford Ave, Old Lyme, CT (Employee: William Obrien) holds a Home Improvement Contractor license and 3 other licenses according to the Connecticut license board.
Their BuildZoom score of 94 ranks in the top 24% of 12,093 Connecticut licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring William O'brien, we recommend double-checking their license status with the license board and using our project planner to get competitive quotes.
William O'brien Services
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William O'brien Contact Information
Address: 11 HARTFORD AVE, Old Lyme, CT 06371
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William O'brien Old Lyme
Quality
94
76th percentile
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
William O'brien has a BuildZoom score of 94, which places them above 76% of 12,093 contractors in Connecticut.
Activity
|
2 projects
|
2025 |
Our building permit records indicate that William O'brien has worked on at least
2.0 projects over the past year.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Pricing
|
2 projects
|
$5k-$20k |
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
Residential mechanical hvac repair or replacement permit application
2025-05-07
Replace oil fired steam boiler
Valuation:
$6,500
Permit #:
MR-013506-2025
Status:
applied
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Installing of 2 combi boilers & baseboard for bathroom floors
Valuation:
$9,000
Permit #:
PR20251492
Status:
issued
Fee:
$302
Permit Type:
N/A
Building Type:
N/A
No Description Available
Valuation:
$8,000
Permit #:
B-17-64
Status:
complete
Fee:
$138
Permit Type:
Residential alter
Building Type:
One & two family
Interior renovations to kitchen and porch. (all mechanicals included)
Valuation:
$23,000
Permit #:
B-12-478
Status:
issued
Fee:
$387
Permit Type:
Renovation interi...
Building Type:
Single family
Bathroom remodel. trades not included
Valuation:
$3,900
Permit #:
13848
Status:
issued
Fee:
N/A
Permit Type:
Alteration/renova...
Building Type:
Single family
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Verified License
BuildZoom confirmed this contractor's license
William O'brien License info
License Not Verified
| License # | HIC.0703357 |
| Status | Active |
| State | Connecticut |
| Type | Home Improvement Contractor |
| Date Issued | 09-25-2025 |
- When BuildZoom last verified this license, it had an expiration date of March, 2026. Check the current license status of William O'brien with the Connecticut Department of Consumer Protection
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | HTG.0303623-S1 |
| Status | Active |
| State | Connecticut |
| Type | Heating, Piping & Cooling Unlimited Contractor |
| Date Issued | 09-01-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for William O'brien at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Verified License
| License # | PLM.0203804-P1 |
| Status | Active |
| State | Connecticut |
| Type | Plumbing & Piping Unlimited Contractor |
| Date Issued | 11-01-2025 |
- BuildZoom verified this license was active as of June 2026.
Verify this license's status for William O'brien at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | HIC.0571304 |
| Status | Inactive |
| State | Connecticut |
| Type | Home Improvement Contractor |
- According to the Connecticut Department of Consumer Protection, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for William O'brien at the Connecticut Department of Consumer Protection.
This is a sample of licensing data; click here to access a complete history.
94
BuildZoom Score
William O'brien Employees
WO
William O'brien
WO
William Obrien